The contact owns a 2007 GMC Envoy. The contact stated while driving approximately 60 MPH and also at other speeds, the low beam headlights became inoperable. The contact was able to activate the high beam headlights to continue driving. The contact stated that the failure with the low beam headlights was intermittent. The contact stated there was no warning light illuminated. The contact had not taken the vehicle to a local dealer or independent mechanic to be diagnosed or repaired. The contact purchased replacement bulbs for the vehicle however, the failure persisted. The contact researched and related the failure to NHTSA Campaign Number: 15V519000 (Exterior Lighting) however, the VIN was not included. The manufacturer had not been informed of the failure. The failure mileage was approximately 153,000.

- Clearwater, FL, USA

The contact owns a 2007 GMC Envoy. When the vehicle was started, the daytime running lamps were activated and the green indicator was illuminated. After approximately 90 seconds, the daytime running lamps deactivated and the green indicator was no longer illuminated. The contact stated that the failure occurred two other times. The vehicle was taken to an independent mechanic who determined that the headlight module failed and needed replacement. The vehicle was not repaired. The vehicle was not taken to the dealer for diagnostic testing or repairs. The manufacturer was notified of the failures. The approximate failure mileage was 208,000.

- Austin, TX, USA

The contact owns a 2007 GMC Envoy. The contact stated that both low beam headlights and the daytime running lamps stopped illuminating intermittently and the check engine indicator illuminated. The contact stated that the vehicle exhibited the same symptoms as listed in tsb: 4T1241. The vehicle was taken to an independent mechanic who informed the contact of the tsb, but the vehicle was not repaired. The dealer was not notified. The manufacturer was notified and informed the contact that the warranty was expired. The failure mileage was approximately 109,000.

- Kansas City, MO, USA

The contact owns a 2007 GMC Envoy. While driving at various speeds, the headlights failed without warning. The failure occurred intermittently. The vehicle was taken to the dealer where it was diagnosed that the headlight driver module failed and needed to be repaired. The vehicle was not repaired. The VIN was not included in NHTSA campaign number: 15V519000 (exterior lighting). The manufacturer was notified of the failure. The approximate failure mileage was 98,000.

- Franklin, TN, USA